Sliding-door lock



(No Model.)

' T. W. CURL. SLIDING DOOR LOCK.

3mm. z/wmisfvrglw Patented Mar. 13, 1894.

THE nA'nbNu. Lrm

vuaume NiTEo STATES PATENT OFFICE WILLIAMT. W. CURL, OF LOS ANGELES, CALIFORNIA.

SLIDING-DOOR LOCK.

SPECIFICATION forming part of Letters Patent No. 516,592, dated March 13, 1894.

. Application filed October 9, 1893. Serial No. 487,546. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM T. W. CURL, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Latch and Look for Elevator-Doors and otherSliding Doors, of which the following is a specification.

The object of my invention is to provide a latch and lock for elevator doors and other sliding doors, which, while convenientof operation, is so arranged that it looks the door against both lateral and vertical movement and thus secures the door against being unlocked by lifting the door.

I The accompanying drawings illustrate my invention.

Figure 1v is a side elevation of my improved latch and lock in position locking the elevator door in place. The key is shown inserted in the lock ready to unlock the door. This View is taken from the inside of the elevator and the inner plate is removed and the door jamb is sectioned to expose the operative parts of thelock. The unlocking position of the parts is shown in dotted lines. Fig. 2 is a view looking from the outside of the elevator, a portion of the door being broken away to expose the part operated on by the key. Fig. 3 is a vertical section cutting through the keyhole. 33 Figs. 1 and 2 show the line of section. Fig. 4. is a View of the catch plate.

My invention comprises essentially the combination in a lock provided with a suitable catch A of a sliding bolt B pivoted to the case 0 of the lock and provided with the recessed hook b adapted to hook upon, receive, and partially embrace within its recess notch b, the catch A; a pivoted leverD adapted and arranged to actuate the bolt longitudinally, to slide it forward to release the hook from the catch A of the lock; means for retracting the bolt against such lever; the pivoted bolt swinging lever E adapted and arranged to elevate or swing the hook end of the bolt, and means adapted and arranged to return or depress the hook end of the bolt against the action of the bolt-swinging lever.

The means employed for retracting the bolt consists in a spring F secured to the case of the lock and acting against the projection or lug f at the rear end of the bolt. The means made of one piece of wire secured to the case by suitable means such as the lugs I, I.

In order to adapt my lock to be unlocked from the outside of the door I provide the outer side of the bolt B with a key receiving recess J thereby forming on the bolt, the two key receiving shoulders K, K, which are arranged with such relation to the key hole and key bit Z that when the key L is inserted .into the lock and rotated it will first engage the transverse key receiving shoulder K (which is arranged transverse the bolt) and, operating again st such shoulder, will drive the bolt forward against/the action of the bolt retracting spring F and upon the further rotation of the key, the bit will engage the longitudinal key-receiving shoulder K (which extends longitudinally the bolt) and will swing the hook endof the bolt upward out of line with the catch A, thus allowing the door to be slid back.

- The bolt sliding and swinging levers are respectively provided with handles cl and e which are simultaneously grasped by the thumb and finger of the operator and thus forced toward each other. The operation of unlocking thus resulting is as follows: The bolt-sliding lever D first forces the bolt forward so as to withdraw the hook I) from the catch A and then when the hook is fully withdrawn from the catch the bolt-swinging lever E operates to swing the hook end of the bolt away from the catch thus entirely freeing the bolt from the catch. the door until these two movements above specified have been accomplished for the reason that when latched the hook portion 1) extends under the catch and prevents the bolt from being elevated until it has first been slid forward to withdraw the hook portion 1) from beneath the catch; and after the hook portion It is impossible to open IOC b has thus been withdrawn from beneath the catch, the door cannot be slid back until the further movement caused by the bolt-swinging lever raises the hook entirely above the catch into the position shown in dotted lines in Fig. 1. When the bolt has been thus raised so as to clear the catch, the door can be slid back. The key L, when inserted in the lock and rotated, produces this duplex action of the bolt as above specified and thus enables the one using the key to open the door from the outside of the elevator.

The front end of the bolt is beveled on its under side so as to automatically rise over the catch when the door is closed.

The pivot H serves as a stop to prevent the spring F from: retracting the bolt too far.

Thebolt could be made heavy enough at its hook end to operateby gravity to fall into placotohook upon the catch, thus to dispense with the spring G but 1 deem it best to provide the lock with such spring or an: equivalent spring.

Now, having described my invention, what I claim as new, and desire to secureby Letters Patent, is-

1. A lock comprising the catch; thecase of the lock; the swinging and sliding bolt provided with the longitudinal slot and with the recessed hook 1) adapted to hook upon the catch and partially embrace it within its recess b; the pivot secured to the case and projecting into the slot; means for sliding the bolt forward; means for retracting the bolt, and means for swinging the bolt.

2. In a lock the combination of the sliding bolt pivoted to the case of thelock and adapted and arranged to slide longitudinally and provided at one end with a hook adapted to hook upon the catch of the look; a pivoted lever adapted and arranged to actuate the bolt longitudinally; means for retracting the bolt against such lever; a pivoted bolt-swingin g lever adapted and arranged to swing the hook end of the bolt, and means adapted and arranged to return the hook end of the bolt against the action of the bolt swinging lever.

3. In a lock the combination of the slidi'ng bolt pivoted to the case of the lock and adapted and arranged to slide longitudinally and provided with a transversely arranged key-receiving shoulder and with a longitudinally arranged keyreceiving shoulder arranged inconjunctionwith eachother; means for depressing thehook end of the bolt; means for retracting said bolt;- the'case-ofi the lock provided with a key-hole arranged with relation to the key receiving shoulders and a key provided with a bit arranged with such relation to the key-hole and the shoulders that whenthe key is rotated in the key-hole the bit will in turn operate upon one shoulder to drive the bolt longitudinally and then upon the other shoulder to swing the bolt u pon its pivot.

W. 'l. W. CURL.

Witnesses:

JAMES R. TOWNSEND, ALFRED I. TOWNSEND. 

